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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Insurance Premiums [Line Items]  
Three months ending, March 31, 2016, Total Expected Future Premium Earnings $ 47
Three months ending, June 30, 2016, Total Expected Future Premium Earnings 47
Three months ending, September 30, 2016, Total Expected Future Premium Earnings 45
Three months ending, December 31, 2016, Total Expected Future Premium Earnings 44
Twelve months ending, December 31, 2017, Total Expected Future Premium Earnings 162
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings 149
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 138
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 128
Five years ending, December 31, 2025, Total Expected Future Premium Earnings 486
Five years ending, December 31, 2030, Total Expected Future Premium Earnings 287
Five years ending, December 31, 2035 and thereafter, Total Expected Future Premium Earnings 254
Total Expected Future Premium Earnings 1,787
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,591
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Sixteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,549
Unearned Premium Revenue [Member] | June Thirty Two Thousand Sixteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,507
Unearned Premium Revenue [Member] | September Thirty Two Thousand Sixteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,467
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Sixteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,428
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Seventeen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,284
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Eighteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,151
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Nineteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 1,028
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 914
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 481
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 224
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Five And Thereafter [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 0
Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2016, Total Expected Future Premium Earnings 22
Three months ending, June 30, 2016, Total Expected Future Premium Earnings 22
Three months ending, September 30, 2016, Total Expected Future Premium Earnings 21
Three months ending, December 31, 2016, Total Expected Future Premium Earnings 20
Twelve months ending, December 31, 2017, Total Expected Future Premium Earnings 77
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings 70
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 64
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 58
Five years ending, December 31, 2025, Total Expected Future Premium Earnings 217
Five years ending, December 31, 2030, Total Expected Future Premium Earnings 123
Five years ending, December 31, 2035 and thereafter, Total Expected Future Premium Earnings 108
Total Expected Future Premium Earnings 802
Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2016, Total Expected Future Premium Earnings 20
Three months ending, June 30, 2016, Total Expected Future Premium Earnings 20
Three months ending, September 30, 2016, Total Expected Future Premium Earnings 19
Three months ending, December 31, 2016, Total Expected Future Premium Earnings 19
Twelve months ending, December 31, 2017, Total Expected Future Premium Earnings 67
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings 63
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 59
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 56
Five years ending, December 31, 2025, Total Expected Future Premium Earnings 216
Five years ending, December 31, 2030, Total Expected Future Premium Earnings 134
Five years ending, December 31, 2035 and thereafter, Total Expected Future Premium Earnings 116
Total Expected Future Premium Earnings 789
Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2016, Total Expected Future Premium Earnings 5
Three months ending, June 30, 2016, Total Expected Future Premium Earnings 5
Three months ending, September 30, 2016, Total Expected Future Premium Earnings 5
Three months ending, December 31, 2016, Total Expected Future Premium Earnings 5
Twelve months ending, December 31, 2017, Total Expected Future Premium Earnings 18
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings 16
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 15
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 14
Five years ending, December 31, 2025, Total Expected Future Premium Earnings 53
Five years ending, December 31, 2030, Total Expected Future Premium Earnings 30
Five years ending, December 31, 2035 and thereafter, Total Expected Future Premium Earnings 30
Total Expected Future Premium Earnings $ 196